Electrical selective mechanism.



A. H. F. SCHAAR.

ELECTRICAL SELECTIVE MECHANISM.

APPLICATION FILED NOV. 1, 19 09. 1 ,1 59,71 4, Patented Nov. 9, 1915.

8 SHEE 1 WITNESSES; INVENTOR AnoLPH H.F.SCHAAR 1%1 TE/6% I I HIS A TORNEY.

COLUMBIA PLANOGRAPH cc.. WASHINGTON. n. c

A. H. F. SCHAAR.

ELECTRICAL SELECTIVE MECHANISM.

APPLICATION FILED NOV- 1, 1909.

8 SHEETS-SHEET 2.

WITNESSES; mvzm-on AnoLPH H.'F.SGHAAR f/Zd ms ATTO NEY.

COLUMBIA PLANOGRAPH Cu. WASHINGTON. D, c.

A. H. F. SCHAAR.

ELECTRIQAL SELECTIVE MECHANISM. APPLICATION mannov. 1, I909.

l 1 59,71 4. Patented Nov. 9, 1915.

8 SHEETS-SHEET 3.

' ms ATTORNEY.

COLUMBIA PLANOGRAPH C0" WASHINGTDN. D. C.

A. H. F. 'SCHAAR.

ELECTRICAL SELECTIVE MECHANISM.

APPLICATION FILED NOV. 1, 1909.

1 ,1 59,714. Patented Nov. 9, 1915.

8 SHEETSSHEET 4.

mvcm'ron Anol. PH H. F. SCHAAR QM N I 5 ATTORNCY.

A. H. F. SCHAAR.

ELECTR1CAL SELECTIVE MECHANISM.

APPLICATION FILED NOV 1, 1909. v

- Patented Nov. 9, 1915.

8 SHEETSSHEET 5.

mv}: NTOR Auoum H.F. SGHAAR W 7%7 H l5 ATTORNEY.

COLUMBIA PLA'NOGRAPH c0., WAH|NGTON, D. c.

A. H. F. SCHAAR.

ELECTRICAL SELECTIVE MECHANISM.

APPLICATION FILED NOV. 1, I909.

1,159,714. Patented Nov. 9, 1915.

8 SHEETSSHEET 6.

Fyjd 16f 1 7 a 61% ADOLPH H.F.ScuAAEz @W I BY M Hi5 ATTORNEY.

COLUMBIA PLANOGRAPH C0., WASHINGTON. D c.

A. H. F. SCHAAR. ELECTRICAL SELECTIVE MECHANISM.

APPLICATION FILED NOV-1 1909- 1,159,714. Patented Nov. 9, 1915.

a SHEETS-SHEET 7.

146 .149 74 Jill 1: o 147 I k I I w 14/ 1! W I] I. W w 1 3 Relay INVENTDR Aooum H.F.SCHAAR COLUMBIA PLANOGRAPH co., WASHINGTON. n. c.

WITNESSES; flwwniifrr Jude/m r finale:

"I 5 ATTORNEY.

A. H. F. SCHAAR. ELECTRICAL SELECTIVE MECHANISM.

APPLICATION FILED NOV. 1, 1909.

1,1 59,714, Patented Nov. 9, 1915.

8 SHEETS-SHEET 8.

25 WITNESSES; lNVENTOR H l9 ATTORNEY COLUMBIA PLANDGRAPH co, WASHINGTON. D. c.

UNITED STATES PATENT OFFICE.

ADOLPH H. F. SCHAAR, OF OAKLAND, CALIFORNIA, ASSIGNOR E ONE-HALF TO HARRY W. BISHOP, OF OAKLAND, CALIFORNIA.

ELECTRICAL SELECTIVE MECHANISM.

Specification of Letters Patent.

Patented Nov. 9, 1915.

Application filed November 1, 1909. Serial No. 525,610.

1 b all whom it may concern:

Be it known that I, AooLrH H. F. SCHAAR, citizen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented new and useful Improvements in Electrical Selective Mechanism, of which the following is a specification.

The object of my invention is to provide means for selecting a number of points in one station, or a different number of points in one apparatus in a station, or a different number of stations; overa single telegraph wire.

I make use of an ordinary telegraph line, substituting my sending apparatus for the Morse key, and my receiving apparatus for the receiving sounder. I also-substitute polarized relays where the common relays are in use.

My present form of selector system requires the use of a polarized relay because negative and positive impulses are used and sent out over the telegraph wire to operate the receiving apparatus.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, in which Figure 1 is a diagrammatic view of the mechanism. Fig. 2 is a diagram showing the sending circuit of the mechanism. Fig. 3 is a diagram showing the receiving circuit of the mechanism. Fig. 4 is a cross-section of the device. Fig. 5 is a plan view of the same. Fig. 6 is a side elevation showing part of the receiving mechanism. Fig. 7 is an inverted plan view of same. Figs. 8 and 9 show the stationary disks. Fi s. 10 and 11 are charts showing the arrangement of electrical i111.- pulses in a three and four impulse system. Fig. 12 is a diagrammatic view showing the relation of disks and their blades to each other. Fig. 13 is an end view of the last set of magnets diagrammatically shown in Fig. 1. Fig. 14 is an end view .of the keyboard mechanism. Fig. 15 is a broken-away plan view of the keyboard circuit mechanism. Fig. 16 is a side elevation of same. Fig. 17 is a diagrammatic view showing an ordinary telegraph system on which my system is based.

In order to make clear certain following descriptions, I show, in Fig. 17, an'ordinary telegraph line equipped for sending and re-. ceiving the Morse code.

The electrical current in present telegraph 1 systems is derived from specially constructed dynamos "which have taken the place of batteries formerly used. It is immaterial, however, by what means the electrical current is generated. To simplify explanations I will make use of batteries. In regular tele graph work one pole of the battery is grounded and the other pole is connected to one terminal of theMorse key, the other terminal of the Morse key is connected to the terminal of the relay, the other terminal of the'relay connects to the outgoing wire, the end of the outgoing wire connects to the terminal of the receiving relay at the other end ofitheline, and the other terminal of the relay is grounded. When the Morse key is fullyfdepressed and r the contacts on the Morse key are closed, the line circuit is closed. 'The line current flows from the battery through the relay (in the sending; station) along the telegraph wire to the receiving station and through the receiving relay into the ground, returning through the ground to the battery. Each time the line circuit is closed the electro-magnets on the y relays are energized, and the armature on the relay is magnetically attracted toward the electromagnets, and a contact on the armature meets another contact on the relay. These two contacts close the electrical circuit which operates the sounder. The sounder circuit derives its electrical energy not from the line batteries, but from separate batteries in the receiving station. We have, therefore, one circuit which is called a line circuit, which tends to operate the relays when the Morse key is closed and opened, and another circuit, called the local circuit, which tends to operate the sounder when the relay contacts are closed and opened. It will therefore be seen that the line circuit does not directly infect the sounder. "It only affects the relays, and the relay'contact points in turn close and open an auxiliary circuit (the local circuit, as hereinbefore mentioned).

7 When it is desired to use negative and positive impulses a polarized relay is used,

the armature on which is provided with a contact protruding on both sides of said armature, and electromagnets on each side of said armature. Contact points are also provided opposite both sides of the armature. When the armature is attracted by the one set of electrounagnets, a connectlon is made for the local circuit on that side; when the opposite electro-magnets attract the armature toward them, a connection is made on that side for the local circuit. A polarized relay is so mechanically and electrically arranged and constructed that at though the line current, Whether negative or positive in character, flows through both sets of electro-magnets and aliects both sets of electro-magnets, the armature is drawn in one direction only, corresponding to the character or the electrical current flowing through the relay. It is common practice to refer to a, polarized relay as having a negative and positive side. A negative impulse over the line Wire affects the negat ve side; a positive impulse over the line Wire aiiects the positive side.

From the foregoing explanations, it can be seen that any particular one of the lTWO sets of contacts, on the polarized relay, can be closed by closing the line circuitand by using a proper character of current; that by closing the line circuit with the Morse key on a negative current, the relay contacts close on the negative side, connecting and closing the local circuit on that side; that by closing the line circuit With the Morse key on a positive current, the relay contacts close on the positive side, con necting and closing the local circuit on that side; and that the props manipulation of the Morse key, and by using the necessary character of current, Will correspondingly properly manipulate a sounder, the local circuit of which is closed onthe negative side of the relay, and also a sounder, the local circuit of which is closed on the positive side or" the relay. As I make use of an ordinary telegraph line, circuit and polarized relays, it will also be seen. that I can operate my receiving mechanism at any distance at which it is possible to operate a sounder by the telegraph Wire systems of today.

instead of opening and closingthe line circuit with the Morse key, 1 accomplish this same purpose with my sending apparatus. 1 also substitute my receiving apparatus for the sounder; the local circuit then operates my receiving mechanism instead of the sounder. If it is possible to'send a message a distance of five thousand miles by the Morse system, it is possible .tor' me to operate my mechanism the same distance.

1 will now describe the method I employ to select any one of a different number of points over a single Wire. While it is true I employ the regular telegraph circuit, it will be manifest that the ultimate results I accomplish are radically difi erent from anything suggested or possible by the ordinary telegraph system.

I combine a number of electrical impulses to select one point; (by point 1 mean a letter or numeral or semaphore or signal or anything or a like nature to be reproduced or operated). For each point to be selected I use the same number of impulses, but the impulses are negative or positive, or negative and positive, in character. I combine an equal number of impulses for each point to be selected, but the arrangement of negative and positive impulses in each combination is different. For example: Say that I use three impulses for each particular point to be selected (see chart, Fig. 10) for point No. 1, the first impulse is positive, the second negative, and the third negative; (the dots represent positive impulses, and the blanks negative impulses); for point No. 2, the first impulse is negative, the second positive, and the third negative; for poin No. 3, the first impulse is negative, the second negative, and the third positive; for point No. a, the first impul e is positive, the second negative, and the third positive; for point No. 5, the first impulse is positive, the secondnegative, and the third ne ative; for point No. 6, the first impulse is negative, the second positive, and the third positive; for point No.7, theiirst impulse is negative, the second negative, and the third negative; and for point No. 8, the first impulse is positive, the second positive, and the third positive.

W e have new formed eight combinations,

three impulses to a combination, and by changing the negative and positive charactor of the impulse We have formed eight different combinations. It will also be found that eight is the maximum number of combinations that can be formed using three impulses. It will; also be found that by using four impulses to a point .(see chart, Fig. 11) 16 difi'erent combinations can be formed 5 that by using live impulses to a point, 32 dilierent combinations can be formed; by using six impulses to a point, 64 combinations; seven impulses to a point, 128; eight impulses to a point, 2563; nine impulses to point, 512; and ten impulses to a. point, 1024:. It will be seen by the foregoing that addng one impulse to a previous combination. increases each successive combination two times the previous one.

As the number of points that can be selected over one Wire is controlled by the number of lmpulses used to a combination, it is neces sary to ascertain beforehand the maximum number of points it is desired to select, and then to make use of that particular combination which will give us the required number of selective points. If We require not more than eight selections, as, for example, for certain conditions of block signal sy tems, then We use No; 3 combinations; that means three impulses to every one selective point. If we require 1000 selections, we use No. 10 combination; that means ten impulses to every one selective point. If for telegraphic purposes, a six point selection would do, because the sixty-four selections possible would more than be sufiicient to represent the various letters of the alphabet, numerals, punctuations, etc.

The foregoing explains what I term my combination scheme. I shall now explain how I make use of this scheme. In the following description I shall particularly refer to the sending and receiving of No. 3 combi' nation impulses, and which gives us eight selective points:

Referringto Fig. 14 and Fig. 2, the keyboard of the sending apparatus is presumed to be provided with eight keys A, where it is desired to construct the keyboard to make the maximum number of selections possible with the No. 3 combination. I also arrange and constructthe keyboard so that when a key is fully depressed will close and open the line circuit three times-in rapid succession. Furthermore, as the three impulses are negative or positive, or negative and positive in character, a key when fully depressed must close the line circuit so as to send out negative and positive impulses corresponding to one selection of the No. 3 combination; each key when fully depressed sending out three impulses, but of difiterent selection.

In the drawings I have illustrated the invention as embodying the No. 3 combination system simply as a matter of convenience.

As shown in F 1 each key A carries a plunger bar 2 having three laterally project ing pins 8. These three pins are'designed to operate simultaneously three particular keyboard circuit closers which may control currents of negative character or positive character, or one or more negative currents and the rest positive. In any event it is to be understood that in the No. 3 combination system plunger bar simultaneously operates only three keyboard circuit closers to close as many circuits. The keyboard circuit closers for what I shall merely term the positive side circuits, to simplify explanations, are represented by arms l secured to rock shafts 5, these rock shafts carrying op positely projecting arms 6 which have insulated tips 7 arranged to close each aseparate pair of keyboard contacts in a particular branch of the keyboard circuit which has six branch circuits, one for each pair of contacts. These contacts are arranged in pairs, one above the other, there being six pairs, three on the positive side and three on the negative side, and the contacts of the respective pairs for the positive side being represented by 89, 1011, and 1218. The

keyboard circuit closers for the negativeside are represented by arms 14 secured to rock shafts 15 with oppositely projecting arms 16 on therock shafts working each a respective pair of contacts l718, 19-20, and 2122. All these several contacts are suitably supported and insulated, as shown at 23, and the wires for the several branches of the keyboard circuit lead from these connections 23. F or convenience of illustration, and to simplify the explanation, in Fig. 2 the keyboard branch circuit wires leading from these contacts ,89, 1011, etc., are given the same reference numerals as their contacts. The several arms 1'1ft are engaged on top by certain of the pins 3 on the respective plunger bars 2. In Fig. 14:, although there are six various keyboard circuit closers shown, three on the positive side and three on the negative side, it is understood that a single plunger bar 2 controls only three of these circuit closers; 2111(1'111 Fig. 1 the three circuit closers controlled by the one plunger bar are represented by one positive side keyboard circuit and two negative side keyboard circuits, which corre spond to selection No. l of the No. 3 combination system, Fig. 10. Thus when the key A havin the plunger bar 2, in Fig. 14 is depressed, this key will simultaneously close the keyboard contacts 89 on the positive side, and contacts 1920, and 21'22 respectively, on the negative side, making simul taneous connection for three of the six branches of the keyboard circuit, these three circuits controlled by the automatic electrical switch mechanism with which the send ing mechanism is provided, as will be hereinafter explained, closes and opens the line circuit three times in rapid succession, thereby closing and o iening the relay contacts on the polarized relay three times, as the positive side keyboard contacts when closed permit the keyboard circuit to actuate a part or side of the sending mechanism which closes and opens a main line telegraphic transmitter 62 on a positive current, and the negative side keyboard contacts similarly close and open a main line telegraphic transmitter 61 on a negative current, all as will be more fully explained later. This key A. consequently sends the first impulse positive, the second negative, and the third negative. And so when any one of the eight keys is fully depressed. it sends out a selected group of three electrical impulses over the line wire 60 corresponding to the key depressed.

The electrical sending mechanism consists,

as represented grapl'iically in Fig. 2, of six eleetro-magnets 24525, 2627. and 2829 disposed in pairs 24- 25, etc., forming three horizontal rows, one pair in a row. The three electro-magnets on the right, 25 27-29 I shall term positive side magnets. and they control a series of keyboard circuit switch mechanisms, hereinafter to be described, which in turn control the positive line circuit; and the three negative side magnets "2+l2( -2S, so termed to simplify explanations. similarly control a series of keyboard circuitswitch mechanisms which in turn control the negative line circuit. I sh all accordingly speak of these magnets as positive side and-negative, si le magnets, acc ling to the positive and negative cha acter of the line current represented by them. hose six magnets etc. have respective armatures 3031, 32 33, and 3'-l35, and these several armatures carry pairs of respective contacts as follows: that is to say. armature carries contacts 3(3-3T; armature 531 carries contacts 3839; armature 32 carries contacts 4-0 armature 33 carries co tacts l2*i-3; armature 34L carries contacts and armature 35 carries contacts iii-1 7. These sev ral contacts %37, etc. coopeate with relatively fixed respect've contacts 36'37, etc. All the armaturcs are normally held away from their magnets when the latter are inert, by suit able means, as the springs l8; and the contacts 536 336. 37-437, etc, are normally in contact to close that branch of the keyboard circuit respectively controlled by them.

The energizing of the various electromagnets is effected by the following means: By reference to the diagrammatic view of the sending mechanism shown in Fig. 2, it is observed that the actuating key A is turnedaround from. its position shown in Fig. 1, so that in Fig. 2 the so-called negative side is shown above the bar 2, and the so-called positive side is shown below; the wires 89, 1011, and ili-l3 operating the positive magnet side of the apparatus. By reference to this diagrammatic view of Fig. 2. it will be observed that the wires 182022 on the negative side of the keyboard lead to arespective set of contacts 1S--0-22. It will also be observed that the wires 8-1012 on the positive side of the keyboard lead to a respective set of contacts S-10-12 which are opposed to the respective negative side con tacts 1S-20 22. Also arranged with respect to the contacts 1S20'22 are spring switch members 50-5152 which have insulated cam ends 5353-53, these switch members 5051 52 being operated to also close and open the keyboard circuit (in conjunction with contacts 3G35'3737'38-3S -39-39', etc, and the keyboard contacts 89, 17-18, etc.) as will. be later seen, by respective cam toothed ratchets 5-l55-56. These several switch members 505l-52 are arranged in parallel connected to a wire 57 which runs to the keyboard battery 58 which operates all three pairs of magnets used in sending No. 3 combination impulses. The other pole of the battery is connected through the wires 59-59 with one terminal of each of the six magnets 2%.425, etc. The opposite ter minals of these magnets are connected back to the keyboard as follows: The negative side magnets 2 l2628 have one of their terminals connected with a respective wire 17l921; and the positive side magnets 25-27 "29 each have a terminal connected respectively with a wire 9lll3. That is to say, the branch keyboard circuit through wire 1? from the keyboard will pass through contacts l l l 't, -il6'l6 to its 1nagnet 2%, assuming, of course, that magnets ZS-29 are ceenergized. The branch circuit through wire 19 will pass through contacts 3S, 36 36 to magnet Edassuming, of course, that magnets are deenergized. The branch circuit through wire 21 will pass thrcughcontacts i-L.-"-il, l0%l;0 to magnet 28, assuming, of course, that magnets 2627 are die-energized. The same will be corre spondingly true of the branch keyboard circuits passing through the positive magnet side wires 9. 1ll3, in so far as each one of these branch circuits must pass through a double set of respective contacts before going to its magnet, each circuit, of course, being successively interrupted ifthe mag nets which control these particular contacts are energized at that time- Each circuit is also successively interrupted by the keyboard circuit controller ratchets 5e4 5 5c.

The energizing cf the magnets 2i-25, etc, and thecorresponding operation of the keyboard circuit controllerratchets 51-5556 results in the closing of the main line circuit 60 which is either negative or positive, according as tie transmitter or 62 is 0.1. negative or positive; these transmitters 6162 connecting, respectively, with the negative and positive sources of electrical supply, as the main line batteries 63-64. The main line wire 60 has interposed in. it a polarized relay 65 at the sending station, and a similar polarized relay 66 at the receiving station, Fig. 3. It will be understood, however, later herein, that each polarized relay 65 and 66 serves for receiving Fig. 1.

The positive transmitter 62 is controlled from the positive side magnets 25-27-2-9- by suitable means, as the following: The transmitter 62 comprises an arm on a rock shaft 63' carrying a series of arms 6S69 70 corresponding to each magnet 25-*2T29. A spring 71 acts on the transmitter 62 normally to open it. Each of the arms 6S69-7O is engageable by a pin 72 on the respective armatures 31-3335, so

that when any one of the magnets 2527-29 is energized, the pulling down of an armature will result in the rocking of the shaft 7 and the closing of the positive main line circuit 60.

Similarly, the negative trans- Y mitter 61 is carried by a rock shaft 67 which has arms 68- -6970 similarly actuated on the energizing of any. one of the negative side magnets 242628.

The operation of the keyboard circuit controller ratchets 54, 55, 56 when any one of the magnets 2425, etc., is energized, is accomplished as follows: These ratchets are all fixed on one shaft 73 which carries ratchets 7474" (Figs. 4-5), respectively, operative by pawl and stop mechanism carried on a lever 75 secured to a rock shaft 7 6. A spring 77 acts on the arm 75 to lift it, so as to maintain it normally in position ready to actuate the ratchet 74, one tooth at a time, when the lever 7 5 is pulled down. The shaft 76 carries three arms 78, 79, 80, each of these arms having pivoted to it a respective latch members 81, 82, 83. These latch members 81, .82, 83 are arranged between the ends of the alined armatures 30, 31, 32, 33, 34, 35, and each of these latches has apposed hook members 84 underneath the ar-, matures in such fashion that when any armature is attracted it will pull down on a respective latch 81, 82, 83, rock the shaft 7 6 and so actuate the ratchet 74 and consequently the keyboard circuit controller ratchets 54, 55, 56. It makes no diiference winch of the six magnets are energized, the rock shaft 76 will be rocked and the keyboard circuit controller ratchets 54, 55, .56 will all turn one tooth space in unison. The ratchets 54, 55, 56 and the teeth disposed on same are so positioned on the shaft that one of the ratchets, as 54, will always stop after a series of impulses corresponding to a selection has been sent, just as the cam end 53 of its switch has been engaged by a tooth on the keyboard circuit controller 54, so as to prepare a connected path for that branch of the keyboard circuit between the several contacts 818'50. The keyboard branch circuit controlled by the circuit controller ratchet will. be broken, as shown, because the insulated cam end 53 rests in an interdental space on the ratchet 55. The next circuit controller ratchet 56 will have been turned so that the contacts 12, 22' and 52 are still closed, and the circuit controlled by them is held closed as long as a key on the key- .woard is held fully depressed, thereby also holding the line circuit closed during that time. The current meanwhile cannot pass through contacts 8, 18, 50, as either one of the magnets 28, 29 is held energized as long as the key is held fully depressed and either set of contacts 44, 44 and 45,

45, or 46, 46 and 47, 47, is consequently" open. The moment the pressure on the key is released, the magnet 28 or .29, as the case may be, is deenergized, and the contacts- 44. 44 and 45, 45, or 46, 46 and 47, 47, are

closed, when the respective armature isaeturned to its normal position. The insulatmg cam end 53 will then be just on the verge of dropping into the next notch, so

that the slightest movement of the keyboard circuit controller ratchet 56 will disrupt the local circuit at 12, 22, 52, when a keyis again depressed. The object of positionmg the circuit controller teeth on the ratchets 54, 55, 56 in the manner described is simply to effect the proper timing of the.

sending of the impulses in sequence and not have them interfere with one another, and

to enable the operator to hold the line cir-' ratchet 56 does not interfere with the send ing of impulses-in proper sequence, for the instant shaft 73 is acted upon, when a key is depressed, the .cam end 53 on switch member 52 drops down, opening contacts 12, 22 and 52, instantly opening the branch circuit at that point. The first branch keyboard circuit that operates the sending mechanism 8-9 or 1718, upon the. depression of any key always passes through the contacts 8 and 50 or 18 and 50, the others operating in sequence. These circuit controller ratchets 54, 55, 56 operate independently and indifferently of the character of the current, whether negative or positive, andthe current which comes in over the keyboard wire 57 and through the switch 50 may be either negative or positive in character. It is the particular negative or positive, or negative and positive side magnets energized and deenergized in proper sequence which determines the particular selective group of the combination. That is to say, if the firstmain line impulse is to be positive in character, the keyboard circuit will pass through 8, 8, 50, 57 to keyboard battery 58, wire .59, through magnet 25 to 9, through wire 9 and contacts 45, 45, 47, 47, back to 9 at the key A. If the first main line impulse is to be negative in character,-

the keyboard circuit will pass from the con tact 17' at the keyboard through 18, 18, 50, 57, keyboard battery 58, keyboard wires 59 and 59, negative side magnet 24, wire. 17, through contacts 4646, 4444, and

thence back over thewire 17 to the contact This closing of either of these branch keyboard. circuits conse; quentlv energizes the corresponding ma'gnet 17 at the keyboard.

If the negative side circuit is closed, which we have last traced, it will result in the energizing of the negative side magnet 24, the

pulling down of its armature 30, and the simultaneous'rocking of the shafts 67 and 7 6. The rocking of the shaft 67, as Will'be seen, Will close the transmitter 61 on a negatire current, resulting in the sending of a negative impulse over the main line Wire 60. The rocking of the shaft 76 serves to actu ate the ratchet 74 and turn the keyboard circuit controller ratchets 5 1, 55, 56 one tooth space. This turning of these circuit, controllers one tooth space corresponds, to the length of time of sending this first negativ main line impulse. As the circuit controller ratchets 542, 5'5, 56'come to rest after this first actuatiomtheswitch 50 rides on of the circuit controller ratchet 5d, disrupting the keyboard circuit through 50; but correspondin 'ly the switch 51 is closed, ready for the sending of the next main line impulse, which may be-eithernegative or positive in character. If We say thatthis second impulse is positive in character, it Will result as described before, in the closing of the transmitter on a positive current, and the sending of a positive impulse over the main line to the receiving station. In the sending of this second and positiveimpulse, the positive side magnet 2-7 has been closed, the currentfrom the battery 58 passing through Wire 57, switch 51,"contact '10, keyboard contacts 1-O-11, thro-i'i'gh Wire 11, contacts 37, 37 and 39, through magnet 27 and Wire 59,back't'o the battery (that is, if magnets 24 or 25 are 'deenergized) resulting again in the rocking of the rock shaft 76 and the turning of the circuit controller ratchets Ba-55, 56, one toothspace, so that the switch 51 is opened and the key-board circuit throughswitch '52 is closed.

If" the third impu'lse'sent by the single depression of the key A is to be negativein character, the negative transmitter 61 will be closed and a negative impulse sent over the main line wire. In thesending of the third and negative impulse, the negative side magnetQS-hasheen closed, the current passing from the battery 58, through Wire 57, Switch 52, contact 22, keyboard contacts 22 21, Wire 21, contacts 42 l2 and lO i0, magnet QS and Wires 59" and '59, back to the battery assuming that magnets '26 and 27 are deener'gized; Thus it will be seen that each time the key closes a branch keyboard circuit through contacts l7,'18,19, 20,21,

.22, or 8-9, 1011, 12-13, it results in the simultaneous actuation of the rock shaft 76 With one or the other of the rock shafts 67- 67 to send either a negative or a positive impulse over the main-line, and to prepareone or the otherof thekey-board circuit branchescontrolled by theswitches 51 to send the next impulse.

From the foregoing it Will. be seen that Whenever a inag'net 2l25, etc.., is energized,

. the pulling down of its armature separates the corresponding double sets of contacts 3636,"37-37, etc, carried by the respec tive armatures, so that Whenever one magnet, as theneg-ative side one 24:, is energized,

the circuit through its companion positive side magnet 25 and the succeeding negative side magnet is interrupted, so that then. arises no confusion of positive and negative, or positive or negative impulses, but only a positive impulse or a negative impulse can be producedat one time.

it will be readily by the foregoing explanation-that thekeyboard circuits have no electrical connection with the line circuit, they serve exclusively to operate the electrical sending mechanism, the latter mechanism operating the two transmitters 61, 62, which. are operated to close and open the line circuit, and that the impulses sent over the line circuit are'the result of the successivecl'osing and opening of the line circuit. It will also be readily seen that the two transmitters 61, '62, are operated to send out'a combined number ofel'ectrical impulses with regard only to combining impulses negative or positive, or negative and positi.ein character and corresponding to a pointto be selected, ut'avithno regard to predetei'mining-each or any impulse, with respectto -length oinp-etential. Each or any impulse in a combinednlunber of impulses may be eitherof t'he d-ot or dash variety or both, of canal or variable strength, and different or like intervals of time may elapse between thesendingof each or anyimpulse.

The iinpuls are-sent out over the line Wire accordingly and correspondingly to the rapidity with which the sending mech anism operates t he two transmitters 61, 62 upon the depression of a sending key,-and the electrical potential. of each impulse is in accordance with the potential of the current used to operate the line'cire-uit. Thetwo transmitters, for example, may be operated alternately or respectively-in rapid or slow or rapid and slow succession, sending impulses of 'diiierent and varying length over the line circuit, and potential of the line current may vary during the sending of these impulses, but this will not interfere with the successful selection ofthe point it isdesirable to select.

hen manipulating the keyboard, no attention is paid to the selection; I number or name the lzeys frrt m 1 to 8, inclusive, and depress that key, thenumber on Which corresponds to the number of theselective point I desire to select at the other end of the line Wire. Should I desire to select 'poisnt No. .6, I fully depress key o- 6, etc Should I require a greater-number ofselectiye points,

sixty-four for'example, I then use No. 6 com-.

board with sixty-four keys. The impulse sending mechanism is then provided with SiX keyboard circuit controller ratchets and twelve magnets, six for operating the negative telegraphic transmitter, and six for operating the positive telegraphic transmitter. lVhen any one of the sixty-four keys is now fully depressed, that key simultaneously closes six of the twelve sets of keyboard circuit closing contacts, making connections for six magnets on the impulse sending mechanism. These six magnets, corresponding to the keyboard contacts closed, are instantly operated by the keyboard circuit; the negative and positive telegraphic transmitters 6l62, or the negative or the positive telegraphic transmitters 61 or 62, as the case may be, sending out six impulses over the line wire. \"v' here a still greater number of selective points are required, as already mentioned hereinbei'ore, a combination is used which contains the required number of selective points, and the keyboard contacts and the number of telegraphic transmitter magnets for each one of the two transmitters 6l62 and the circuit controller ratchets are correspondingly increased. The keyboard is also provided with the required number of keys.

The keyboard and sending mechanism will send that combination only for which it is constructed and intended.

Having explained how in a No. 3 combination system a three point selection is pro duced, and a succession of three impulses, either negative or positive, or a combina tion of positive and negative, are sent over the line wire 60, T will noivdescribe the manner in which these impulses and selected groups of impulses are received and recorded at the other end of the line. The receiving mechanism and the circuits. therefor are graphicallyrepresented in Fig. 3.

By reference to Fig. 3 is will be seen that the receiving mechanism is connected to the contacts 86 8830f the receiving polarized relay 66. Whenever the contacts 8687 on the negative side oi the receiving relay (it? are closed, the receiving mechanisms local circuit is. closed through wires E g--13?) (which correspond to wires 5759 of Fig. 2, as will be seen later) and one of a series of electro-magnets (90, 91, 92, 9% and 95) in the receiving mechanism is energized hen said contacts are opened. the said local circuit is opened and the said one magnet is deenergizcdz when the relay contacts S6S'7 on the positive side are closed, said local circuit through wires (which correspond vith 5'?-59, Fig. closed, and another magnet in said series or magnets is energized; when the positive contacts are opened the said local circuit. is opened and the said magnet is deenergized: allas will more clearly appear hereinafter...

in the "receiving mechanism are used to receive and register received impulses; but not directly from the line wire, but through the closing and opening of the polarized relay contacts 86*87 or 86'8. thesaid contacts being closed and opened by the action of the saidrelay which is energized and deenergized by the closing and opening of the line circuit 60; the said closing and opening tak-j ing place at the keyboard end of the line through the telegraphic transmitters 61 or 62. V

The receiving relay contacts 86' -87 on the negative side, when closed, register the negative impulses passing from the line wire through the relay 66; and the positive side of the relay contacts 8687, when closed, register the positive impulses passing from the line wire through said relay. The negative and positive character of the line circuit is therefore only used to operate the polarized relay 66. V The source of electrical energy which operates the receiving mechanism is derived from a set of batteries 96,, and it is immaterial on which side of the relay the relay contacts 86, 87, 86 close, they close a local circuit flowing from this one said set of batteries 96, and all three pairs of magnets operated in the receiving of No. 3 combination impulses are operated by this one said set of batteries; but when the relay contacts 8687 close on the positive side, the three sets of magnets 9l9395 on the righthand side of the receiving mechanism are only affected;

and when the relay contacts 86', 87 close on the negative-side, the three sets of magnets 90, 92, 94: on the left hand side of the receiving mechanism are only affected.

The electro-magnets 9(l-9l, etc.,'in the receiving mechanism, as already mentioned, are disposed the same as those in the send ing mechanism, and by and through the 010s ing and opening of the relay contacts, on either or both sides of the relay, and also through the. automatic electrical switch mechanism with which the receiving mechanism is also provided, the magnets in the receiving mechanism are energized and dc-. energized in the same order and the same successive order as thesending electro-mag nets; the respective armatures 100-401,

102103,.10 ll05 of said receiving magnets 9l, etc.', duplicating and repeating the same movements, and in the same success sive order; the Increments of the :armatures 3031, etc., on the sending mechanism; but the ar-matures of the receiving mechanism, instead. of operating telegraphic transmitters like 6162, operate respective circuit closing disks 106 107, 108-109, 110-111, con structed of hard rubber or fiber and provided with radial peripheral blades 112. Each respective armature 100 101, etc, on the receiving mechanism has a corresponding disk; as there are three magnets 91, 93, 95 for registering positive impulses, and three magnets 90, 92, 91 for registering negative impulses, thereare six disks, three for positive (106, 108, 110) and three for negative (107, 109, 111). These disks are revolubly mounted on a shaft 113, and each disk can revolve a limited distance on said shaft, and independently of any other disk. By referring to Figs. 6, 7, 1'2 and 3, it will be seen that there are two end disks 111115, making eight in all. T he two extra disks, also con structed of hard rubber or fiber, one at each end of the shaft 113, are firmly secured to said shaft, and like the shaft, are stationary; they carry radial blades 112.

One form of practical construction of a disk and the means for operating it from the magnets is illustrated in Fig. a. Note: While Fig. a shows one practical means for actuating a disk, in the diagrammatic view, Fig. 3 (and Fig. 1) a very simple schematic form of disk actuator 119 120 is shown as attached direct to an armature 100 101, etc, and adapted to engage corresponding projections 121-122 on the disks; also a. schematic form of catch 124125 is shown in Figs. 3 and 1. These latter views simply represent the principle of the invention. To have attempted to reproduce the physical structures of Fig. 4: in the diagrammatic views Figs. 3 and 1 would have led to endless confusion.

Fig. 1 represents the lower or last sets of magnets 9195, (diagrammatically shown in Fig. 3), the stationary end disk 115 being broken away to show the negative last movable disk 111, and the latter disk being broken away so as to show its complementary positive disk 110. In this view there is also shown a means for rotating the movable disks, these means comprising the following parts: Each armature 105 104C (and, of course, the same throughout the series of other armatures) carries a pivoted plunger rod 116 each of which is adapted to engage a corresponding lever 117-118; the lever 117 representing the positive side ofthe machine, and the lever 118 the negative side. Each of the levers 117118 carries a respective actuating hook member 119120 which are adapted to engage with respective radial projections 122121 on their corresponding disks 110111. Energizing the set of mag nets 9 1 will attract its armature 10 1, .push

' down on its plunger rod 116,rock lever 118,

ment of the blades, as previously described.

Each time a disk is revolved it is held securely in its new position against the tension of its spring 123 by means of a catch 12 1 or 125 which is arranged to spring in underneath projections 121 or 122, respectively. The negative disk catches 12 1 are fined to a rock shaft 127, and the positive disk catches 125 are mounted on a rock shaft 126. Independently and pivotally attached to the protruding bearing 126 of shaft 126 is an arm 128 extending horizontally underneath the disks in the direction of the negative catches 124, which arm is engageable with projecting blades 129 and 129 which are respectively attached to the rock shafts 126 and 127 and are so operated on by the arm 128 that whenever the arm 130 (which forms a part of the arm 123) is operated outwardly by a set of releasing magnets 131, to the armature of which the arm 180 is connected, all the catches 124125 will be rocked outwardly and op positely from one another, so as to release all the. disks and allow the springs 128 to return the disks into normal initial disconnected position. Thus it will be seen that each movable disk 106-467, etc., is so mechanically operated by its respective armature 101100, etc, that whenever one of said armatures is attracted by its respective magnet 91 90, etc., the said armature carries its disk with it in its downward movement, revolving the disk a distance of say one-sixteenth of an inch; as the armatures 100 101, etc, of each pair of magnets oppose one another, the three disks 107 109111 operated by the armatures on the left hand side revolve these disks to the left; the three disks 106108-110 operated by the armatures on the right hand side revolve to the right. The contact blades 112, Fig. 7, are aihxed and secured to the outer periphery of all the movable disks, and are so positioned that a successive step by step movement of three of the movable disks 106-111 will form acorresponding electrical connection. between corresponding blades 112 on the stationary end disks 114:115 to close a second local circuit in which. is disposed the sounder, or reproducer, or signal operating magnet 132 or 132, as the case may be. For the number 3 eight contact blades112. On the'two sta tionary disks 114-11'5, Figs. 8-9, it will be seen that the eight. contacts 112.are equally spaced, but on the six movable disks, Fig. 12, they are irregularly spaced, Now each movable disk, when revolved the full distance by its respective armature, is automatically locked and held in that position, the respective armature, however, returning to its normal position. The manner of closing a circuit and working the several magnets successively in the receiving mechanism, Fig. 3, is substantially the same as that described in connec-' tion with the sending mechanism of Fig. 2. By reference to Fig. 3, it will be observed that the armature carrying the contacts'87 of the polarized relay 66 is connected with one pole of battery 96. The other pole of the battery 96 is connected through a wire 133 in series with three switch members 51, 52 which are alike in every particular, and areoperated in every particular the same as their counterparts previously described in Fig. 2 These several switches are operated by the local circuit controller ratchets 54, 55, 56, which ratchets are fixed on a shaft 73 carrying a ratchet 74 operated from a rock shaft 76, which latter in turn is operated through one or the other of the pivoted latches 81', 82,'83 from the magnets 90, 91, etc.

The positive contact 86 on the positive side of the receiving relay 66 is connected by a wire 134 with one pole of eachofthe positive magnets 91, 93, 95. The negative contact 86 of the polarized relay is connected through the wire 135 with one pole of each of the negative magnets 90, 92, 94. The opposite poles of the several magnets 90, 91, etc., are connected back to battery 96 as :follows: Magnet 91 has its pole, opposite to its connection with wire 134, connected to a wire 136, which passes-down through the contact 13'. and opposed contact 137 on anmature 105 of magnet 95, thence 'to the positive side circuit closing contact 136 to switch member 50' and through wire 133 to battery 96; the circuit being closedoand in terrupted from time to time through the opening and closing of the contacts 8786.' Correspondingly, one pole of magnet 93 is connected with a wire 138 to a contact 139 on armature 101 of magnet 91, through op;- posed contact 139 to the positive side con tact 138, thence, when the circuit is closed at that point, through switch member 51",. wire 133, to battery 96. Magnet 95 has its other terminal connected by a wire 140 through contact 141 on armature 103 of magnet 93, through the opposed contact 141, through the positive side contact140 to the corresponding switch member 52,- when the circuit at that point is closed, and

through wire 133 to battery 96. The corie tact member 142, thence through the switch member 50, when the latter is closed, through the wire 133 to battery 96, the cir cuit being closed and interrupted from time to time through the relay contacts 86, S7. The other local circuit wires 144 146 for the magnets 92-94 can easily be traced'in a similar manner.

The circuit of the recording instrument, represented at 132 or 132, is'closed through the operation of the disks 106107, etc., in the following manner, the circuit being closed when the last magnet, either negative side or positive side, 94 or 95, is energized: One of the disks, as 115, is connected bya wire 147, which is in electrical connection always'with allot its peripheral radial blades 112. This'wire 147 electrically con-' nects the pair of contacts 148-149 on the armatures 104-105, respectively, of the two lowermost or last magnets 9495. Opposed to each ofthese contacts 148'149 are respective contacts 148149, and which last named contacts connect by a continuation of the wire 147 with a battery 150 of the recording instrument circuit. It is understood that the recorder, or signal, or semaphore, simply diagrammaticallyrepresented by the element 132132, is repeated for each of the eight selections. In the present case, I have simply shown two of these recording instruments connected with two of the insulated blades 112 on the fixed disk 114. It will be understood that in an eight point selection, such as has been described throughout, there would be eight of these recording instruments 132, etc., and eight line wires 151 151, etc., leadingto a correspondingnumber of blades 112 on the disk 114. Since the circuit through the battery 150 and disks 114-115 can only be completed through the proper alinement of the blades on three of the intermediate moV- able disks 106107, etc., it will readily be understood how my finalselection through one or the other of the recording instru ments 132, etc., 1s accomplished.

In order that the receiving mechanism will be ready to register new. impulses, the movable disks must be released from their catches .124 or 125 and returned to normal position. This isaccomplished as'follows:

If the disk 111.on the negative side is the last disk to be operated andlocked, then a contact member 155 on 'disklll willen gage another contact 156 which is connectr' loo through contacts 152-152 and thereby energize magnet 181 and operate the catches 12-;l125. If .the last magnet in the series to be operated was the positive side magnet 95, then locking the disk 110 will cause .a

; similar action to take place through a contact 160 on the movable positive disk 110 and a contact 161 and the circuit wires 163.157 and 162, the contacts .153153 and wires 159 158, whose connections with thebattery and magnet can easily be traced.

In order to illustrate the operation of receiving a message by the mechanism just described, we will assume that selection No. 2, Fig. 10, is sent o er the line. The operator at the keyboard has depressed No. 2 key; the selection is, first impulse negative, second impulse positive, and third impulse negative. The first negative impulse passing through the receiving relay 66 closes the relay contacts 8687 on the negative side; the local circuit instantly energizing the magnet 90 on the left hand side in the receiving mechanism, or what I shall-term the negative side magnet. The armature 100 on said magnet isinstantly drawn down, moving its disk 107, for instance, with it, the disk being instantly locked and held in that position. As the negative line circuit was closed for an instant by the sending mechanism, and then again opened, the relay contacts on the negative side are similarly closed and opened, and when they opened, negative magnet 90 was deenergizechits respective armature instantly returning to its normal position. The second and positive impulse passing through the relay 66 closes the relay contacts S687 on the positive side, the local circuit instantly energizing the magnet 93 on the right hand side in the receiving mechanism. or what I shall merely term thepositive side magnet. The armature on said magnet is instantly drawn down, moving its disk 108 with it. the disk being instantly lockedand held in that position. The opening of the relay contacts de inergizes positive side magnet 93, its respective armature instantly returning to its normal position. The third and negative impulse closes the relay contacts on the negative side, the local circuit instantly energizing the last negative side magnet 91. Thearmature on said magnet'is instantly drawn down, moving its disk 111 with it, the disk being instantly locked and held in that position.

The sending mechanism is so arranged that as long as akey A is held fully depressed. the ke board circuit continues to energize that set of electro-magnets which last operated the telegraphic transmitter 6'1 0162, either negative .or positive. And the line circuit is therefore held closed until the pressure on the said keyboard key is released.

The receiving mechanism is so arranged that as long as the line circuit is held closed, and which in turn holds either the positive or negative relay contacts closed, the electromagnet last energized continues to be energized, and this set may be either the last negative side magnet 91 or the last positive side magnet 95. As long as the last electromagnet is energized, its respective armature is held down, but the instant the line circuit 6.0 is opened, opening the relay contacts, on whichever side they are held closed, this last magnet 9-1 or 95 is deenergized; its armature immediately returning to its normal position. The instant the last armature, either 104or 105, returns to said normal position, it closes the auxiliary local circuit 158 159 Now the last disk 110 or 111 that was moved and locked, either positive or negative, also made connection. for this auxiliary local circuit, at 160, 161, or 155, 156; thecontacts closed by the armature therefore completing the closing of said circuit. This last men.- tioned circuit energizes the unlocking electro-magnets 131, and its armature when attracted releases the disks held locked. the disks each by means of its spring 123, Fig. 4, instantly returning to their normal position, and the receiving mechanism is again in position to receive another selection.

Onlythree disks are moved and locked to each selection, but not the same three for each selection. The receiving mechanism sets three of the six disks correspondingly with the selection, and we therefore have each setting. difierent and eight different settings, eight being the greatest number of settings that can be obtained with the No. 3 combination. 7

The contact blades 112 on the movable disks are so disposed that when any three disks 106107, etc., are set and locked. one line of contact blades 112 are in connection, one blade contacting with the blade on another disk. and in a strai ht line, forming a complete electrical connection from the point 1 of one blade 112' on one stationarv "disk 115, right through to the opposite blade 1.12 on the other stationary disk 111. If the setting of the movable disks. for example, was done by selection No. 1, then contacts No. 1, on'

method of arranging the contacting blades for a No. 3 impulse combination.

By connecting one pole of the battery 150 to the eight contact blades on one stationary disk, as 115, and then separately connecting eight electro-magnets 132, etc, one to each one of the eight contact blades on the other stationary disk 11%, and then connecting the other terminal wire ofeach one of said electro-magnets 132, etc., to the other pole of the battery 150, we canenergize anyone of the eight magnets 132, etc., by depressing a key on the keyboard, corresponding to the electro-magnet 13213'2, etc., we desire tobe energized. The instant this key is released the receiving. mechanism is instantly unlocked and resets itself. It will be seen by the foregoing description that any one of these eight magnets 132, etc, can be operated at any distance to which it is possible to operate a polarized relay, and that the greatest distance possible is equal to the extreme distance to which the telegraph wire systems of today can send and receive messages.

lVhen the receiving mechanism is to register a No. 6 combination, for example, then said mechanism is provided with six circuit controller ratchets and six pairs of electromagnets corresponding to 9l-95, etc., twelve movable disks, and one stationary disk at each end; six sets of magnets and six disks for registering positive impulses, and six sets of magnets and six disks for registering negative impulses. Each of the fourteen disks is provided with sixty-four contact blades, when the maximum number of selective points obtainable with the No. 6 combination are required.

My selector system can be used for operating signals of various kinds and for various purposes; R. R. signals, for illustration:

It will also be seen that the polarized relay 66 is operated to successively or alternately close and open the two local receiving mechanism circuits withno regard to timing, length or potential of each or anytimpulse used in a combined number ofimpulses and received over the line circuit and that the polarized relav 66' is used to register electrical impulses received over the line circuit with regard only to the character of said impulses. It will also be manifest from the foregoing explanations that a current either negative or positive in character may be used to operate either the local sending or the local receiving mechanism circuits.

The receiving mechanism. through one of the connecting paths formed on said mechanism, can make electrical connection to operate a semaphore. My receiving mecha nism, when used for this purpose, would be inca'sed in a box and the-box secured to the,

disks withall' the contact blades; one row of contacts onlyis necessary, and that row the one-which makes connection for the electrical apparatus used to operate the semaphore. No. 1 semaphore, for example, would have a. rowof contact blades No. 1 on the disks, which set themselves in alinement whenNo. 1 key is depressed; No. 2 semaphore .would have a row of contact blades No.2 on the disks,,which set themselves in alinement when No. 2 key is depressed, etc. Each relay in each semaphore is then connected to the line wire; whenever a key 011 the keyboardis depressed, each relay in each semaphore would operate, and in turn set and lock the disks in the receiving mechanism in each semaphore, but only one par ticular receiving mechanism'would be set with the contact blades connecting one with the other, and that particular mechanism would be the one corresponding to the key depressed, as the other receiving mechanisms disks are not provided with that par- 7 ticular connection. Depressing key No. 1,

for example, would operate eight relays, one

in each one of eight semaphores, but only No. 1 semaphore arm would be raised; de-

pressing key No. would raise semaphore arm No. 5; and in each case, and no matter which one of the eight is operated, the

semaphore can be held raised by keeping the respective key depressed- It can also be arranged that by depressing a key the respective semaphore operated and raised is automatically locked and held in such raised position. When the respective key is released. a second pressure on said key unlocks the semaphore, dropping it.

' My selector system makes it possible to place signals certain distances apart all along a railroad line, the keyboard being placed infthe despatcherls otiicea A despatcher can then, when depressing a key, stop a train anywhere along the line, for a semaphore live hundred miles distant can be as easily and quickly operated as though it were in the despatchers oiiice. 1

-My selector system can also be used in connection with a printing device. The keys on the keyboardwould then be lettered and numberedsimilar to those of a typewriter keyboard, and a combination would then be used which would give us the desired number of selections. one for each letter in the alphabet, eight for the numerals, etc; Thedisks on the receiving mechanism would be provided .ith the necessary number of contact blades,- making connection to electromagnets 132, etc which'operate the typele ers on thetvpewriter. Depressing key A on the keyboardv would make connectype-lever Appri-ntingAvg and so on with the. remainder of the keys.

My sending mechanism can be constructed for sending purposes only, and my receiving mechanism for receiving purposes only; or the two mechanisms can also be combined, .as shown in Fig. 1, (also in Figs. ft, 5 and 13), and by means of the switches 170-190 this combined mechanism can be set to re ceive or to send, as desired. hen the sending and receiving mechanisms are combined, the same sets of electro-magnets 24l25 used for sending, are also adapted for receiving impulses.

As shown in Fig. 1, the switches 170190 are set to send a message over wire 60. Switch 1T0 comprises an operating arm on a rock shaft 171, which latter carries three sets of contact arms; a set of contact arms 172, 17 3, 174:, 175, 176 and 177 for preparing the receiving local keyboard circuits to re ceive a message; a set of negative and positive side contact arms 17 817 9 for preparing the sending circuit to send a message, and a contact arm 180 to close the local circuit and the relay contacts 86'86'87, so that the local keyboard circuit can operate the receiving mechanism when impulses are received over the main line 60. Negative side contact 17 8 is adapted, when in the position shown in Fig. 1, to engage a pair of contacts 181182 and connect one pole of the local battery 96 with one pole of the negative side magnets 242628 through the following connections: contact 181, wires 183 and 59', to magnets; and contact 182, wires 18% and 185, to battery 96. Positive side contact arm 179 on rock shaft 171 engages at the same time a pair of contacts 186187 to connect one pole of positive side magnets 25-2729 with one pole of the battery 96, through the following connections: contact 186, wires 188 and 59, to mag nets; and contacts 187, wires 184 and 185, to battery; but the circuit through thenegative and positive side magnets is controlled from the keyboard, as previously described, and it is not necessary here to review the several circuits closed through the operation of the keys A of the keyboard. Suffice it to say that with switch 170 and contact arms 178179 in the position shown in Fig. 1, the magnets are prepared to be actuated for sending purposes, and thereafter the sending operation is precisely as that described in connection with Fig. 2, the same reference numerals being employed in Fig. 1 (also in F 13) that were employed in Fig. 2 for the sending part of the apparatus. For those parts of the receiving mechanism of F :ig'. 1 (also Fig. 13) which are used only for receiving purposes and are not interchangeable with the sending features, I employ the same reference characters employed in Fig. 3. \Vhere circuits or parts in Figs. 2 and 3 are common both to the sending and receiving parts of the apparatus of Fig. 1, I

means have generally in Fig. 1 given them the same designating characters which they bear in the sending apparatus of Fig. 2. Thus circuits 133134t135 of Fig. 3 are called 575959', in Fig. 1, just as in Fig. 2, because they are'one and the same in the apparatus of Fig.1; except for the interposition of the switch. 170 and its parts. Also inFig. 1 (and Fig. 13) the-magnets 9091, etc., of Fig. 3 are'designated as 24-25, etc; also the circuit controller ratchets 54C5558 of Fig. 3 are designated as 5t5556 in Fig. 1, just as in Fig. 2; also Wires 136- -381et014 214-4t14:6 of Fig. 3 correspond to the respective wires S-1012 18-2022 of Fig. 2, and are designated as 8-1012, etc., in Fig. 1.

Switch 190, Fig. 1, connects the main line 60 to the ground when receiving, or to the telegraphic transmitters 6162 and the batteries 63-64 when sending. In Fig. 1, the switch is set for sending a message and consequently is in circuit with the polarized relay and the telegraphic transmitters 61 62 and the batteries (SS-64.

When sending a message the keyboard contacts 89-10-111213-, 171S 19'202122 are normally open; but when receiving a message all these connections are normally closed. Therefore, to receive a message the shaft 171 is rocked to break the connections between the contact arms 17 8179 and their respective contacts 181182, l86187, and to close the connections between the other contact arms 172 17317417517617718O and respective pairs of contacts 172-172 173- 173, etc., 180180. Closing these connections prepares what were formerly the keyboard circuits of the sending machine, but which are now the local circuits of the receiving machine, so that a message may come in over the main line 60 and be recorded by the recording device 132, etc. Each pair of contacts, as 172172 connects with a pair of keyboard wires, as -21'22, to make a closed connection between them for that particular circuit. Contact 180 connects with the common contact 87 of the relay, and contact 180 connects with one pole of the bat tery 96; the other pole of this battery being connected with wire 57 (133, Fig. 3). Also the switch 190 is thrown into position shown in dotted lines, to ground one pole of the relay to complete the main line circuit 60. The various impulses of negative and positive character then received over the main line 60 are registered by the relay, and

the final record made through the magnets 132-432, etc., all as described in connection with Fig. 3.

Thus I have provided an automatic relaying telegraphic or signaling apparatus with means for sending and receiving a selected group-of electric, closely-successive impulses, 

